TCM809
TCM810
TCM809/810-5
10/10/00
2001 Microchip Technology Inc.
DS21602A
FEATURES
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Precision VCC Monitor for 2.5, 3.0V, 3.3V, 5.0V
Nominal System Voltage Supplies
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140msec Guaranteed Minimum RESET, RESET
Output Duration
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RESET Output Guaranteed to VCC = 1.0V (TCM809)
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Low 12
A Supply Current
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VCC Transient Immunity
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Small 3-Pin SC-70 and SOT-23B Packages
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No External Components
TYPICAL APPLICATIONS
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Computers
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Embedded Systems
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Battery Powered Equipment
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Critical
P Power Supply Monitoring
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Automotive
GENERAL DESCRIPTION
The TCM809 and TCM810 are cost-effective system
supervisor circuits designed to monitor VCC in digital sys-
tems and provide a reset signal to the host processor when
necessary. No external components are required.
The reset output is driven active within 20
sec of VCC
falling through the reset voltage threshold. Reset is main-
tained active for a minimum of 140msec after VCC rises
above the reset threshold. The TCM810 has an active-high
RESET output while the TCM809 has an active-low RESET
output. The output of the TCM809 is guaranteed valid down
to VCC = 1V. Both devices are available in 3-Pin SOT-23B
and SC-70 packages.
The TCM809/810 are optimized to reject fast transient
glitches on the VCC line. Low supply current of 12A (VCC =
3.3V) makes these devices suitable for battery powered
applications.
TYPICAL OPERATING CIRCUIT
ORDERING INFORMATION
Part No.
Package
Temp. Range
TCM809xENB
3-Pin SOT-23B
– 40
°C to +85°C
TCM809xVNB
3-Pin SOT-23B
– 40
°C to +125°C
TCM809xVXX
3-Pin SC-70
– 40
°C to +125°C
TCM810xENB
3-Pin SOT-23B
– 40
°C to +85°C
TCM810xVNB
3-Pin SOT-23B
– 40
°C to +125°C
TCM810xVXX
3-Pin SC-70
– 40
°C to +125°C
NOTE: The "x" denotes a suffix for VCC threshold - see table below.
PIN CONFIGURATION
TCM809
VCC
3
2
1
VCC
RESET
INPUT
GND
PROCESSOR
VCC
RESET**(RESET)
GND
TCM809x
TCM810x
1
2
3
*3-Pin SOT-23B/SC-70
NOTE: *3-Pin SOT-23B is equivalent to JEDEC TO-236
** () is for TCM810
3-Pin Microprocessor Reset Monitors
Suffix
Reset VCC Threshold (V)
L
4.63
M
4.38
J
4.00
T
3.08
S
2.93
R
2.63
Z
2.32
NOTE: J version is available for TCM809 only.